Android - DialogFragment(AlertDialog) 中的 ListFragment : Fragment does not have a view

Question

我正在尝试创建一个 DialogFragment，其中嵌套了一个 ListFragment。我正在使用 4.2.2 中添加的嵌套 fragment 我将它与支持库一起使用，所以我的 api 版本应该无关紧要(为了记录，我的操作系统版本也是 4.2.2)。

我尝试添加的列表 fragment 现在只显示字符串，因为我正在尝试添加它，在我添加它之后，列表将包含图像等。所以请传递字符串列表的任何想法对话框对我不好，我的列表会更复杂..此外，我正在尝试将此 fragment 重新用于平板电脑模式。该列表应始终以该模式显示。所以重用很重要。

我的问题是当我尝试将 listfragment 添加到对话框的 FrameLayout 时，找不到它:

java.lang.IllegalStateException: Fragment does not have a view at android.support.v4.app.Fragment$1.findViewById(Fragment.java:1425) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:901) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088) at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444) at android.support.v4.app.Fragment.performStart(Fragment.java:1481) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:941) at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1088) at android.support.v4.app.BackStackRecord.run(BackStackRecord.java:682) at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:1444) at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:429) at android.os.Handler.handleCallback(Handler.java:725) at android.os.Handler.dispatchMessage(Handler.java:92) at android.os.Looper.loop(Looper.java:137) at android.app.ActivityThread.main(ActivityThread.java:5041) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:511) at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:793) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:560) at dalvik.system.NativeStart.main(Native Method)

添加:

也许这个新信息很重要，DialogFragment 显示在 SupportMapFragment 中。当我尝试仅在 SupportMapFragment 中显示 ListFragment 时，它起作用了。此外，当我尝试仅显示 SupportMapFragment 中的 DialogFragment 时 - 它有效。

就在我尝试在 DialogFragment 中显示 ListFragment 时，它失败了。所以它看起来像这样:FragmentActivity -> SupportMapFragment -> DialogFragment -> ListFragment。

SupportMapFragment 中的 DialogFragment 显示如下:

// DialogFragment.show() will take care of adding the fragment
// in a transaction.  We also want to remove any currently showing
// dialog, so make our own transaction and take care of that here.
FragmentTransaction ft = getChildFragmentManager().beginTransaction();
SherlockDialogFragment prev =(SherlockDialogFragment)getChildFragmentManager().findFragmentByTag("dialog");
if (prev != null) {
    ft.remove(prev);
}
ft.addToBackStack(null);

// Create and show the dialog.
SherlockDialogFragment newFragment = new CategoriesDialogFragment();
newFragment.show(ft, "dialog");

请帮助:-)

---

我的 DialogFragment 类是这样的:

public class CategoriesDialogFragment extends SherlockDialogFragment {

// {{ Events

@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
    LayoutInflater inflater = getSherlockActivity().getLayoutInflater();
    View dialogView = inflater.inflate(R.layout.fragment_categories_dialog_fragment, null, false);

    Dialog diag = new AlertDialog.Builder(getSherlockActivity())
            .setTitle("Hello")
            .setCancelable(false)
            .setView(dialogView)
            .setPositiveButton("ok",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {                          

                    }
                }
            )
            .setNegativeButton("Cancel",
                new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int whichButton) {

                    }
                }
            )
            .create();

    FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
    SherlockDialogFragment prev = (SherlockDialogFragment)getChildFragmentManager().findFragmentByTag("fragment_list_categories");
    if (prev != null) {
        transaction.remove(prev);
    }

    SherlockListFragment listCategoriesFragment = new CategoriesListFragment();
    transaction.add(R.id.fragment_list_categories, listCategoriesFragment, "fragment_list_categories").commit();

    return diag;
}
}

我的对话框布局是这样的:

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<TextView 
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:text="sjrdflksjlksjfkldsjflkjsdflksd"/>
<FrameLayout
    android:id="@+id/fragment_list_categories"
    android:layout_width="wrap_content"
    android:layout_height="match_parent" />
</LinearLayout>

我的 ListFragment 类是这样的:

public class CategoriesListFragment extends SherlockListFragment {
public static final String[] TITLES = 
    {
            "Henry IV (1)",   
            "Henry V",
            "Henry VIII",       
            "Richard II",
            "Richard III",
            "Merchant of Venice",  
            "Othello",
            "King Lear"
    };

// {{ Events

@Override
public void onActivityCreated(Bundle savedInstanceState) {
    Log.w("ListFragment", "insideeeeeeeeeeeeeeeeeeeee");
    super.onActivityCreated(savedInstanceState);
    setListAdapter(new ArrayAdapter<String>(getSherlockActivity(),
            android.R.layout.simple_list_item_1, TITLES));

    // setHasOptionsMenu(true);
}

@Override
public void onListItemClick(ListView l, View v, int position, long id) {
    // TODO: Kazaz - implement category pressed
    super.onListItemClick(l, v, position, id);
}

// }}
}

Answer 1

不确定这是否适合您，但也许可以尝试将该代码嵌套在 onCreateView 中。我遇到了类似的问题，它对我有用。

基本上删除你在 onCreateDialog 中的内容，也许是这样的:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragment_categories_dialog_fragment, container, false);

    // And so on...
    getDialog().setTitle("");

    FragmentTransaction transaction = getChildFragmentManager().beginTransaction();
    SherlockListFragment listCategoriesFragment = new CategoriesListFragment();
    transaction.add(R.id.fragment_list_categories, listCategoriesFragment, "fragment_list_categories").commit();

    return view;
}